linux-kernel - [RFC PATCH v2 02/15] mm: Initialize node memory regions during boot

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Date:	Wed, 10 Apr 2013 03:16:06 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	akpm@...ux-foundation.org, mgorman@...e.de,
	matthew.garrett@...ula.com, dave@...1.net, rientjes@...gle.com,
	riel@...hat.com, arjan@...ux.intel.com,
	srinivas.pandruvada@...ux.intel.com,
	maxime.coquelin@...ricsson.com, loic.pallardy@...ricsson.com,
	kamezawa.hiroyu@...fujitsu.com, lenb@...nel.org, rjw@...k.pl
Cc:	gargankita@...il.com, paulmck@...ux.vnet.ibm.com,
	amit.kachhap@...aro.org, svaidy@...ux.vnet.ibm.com,
	andi@...stfloor.org, wujianguo@...wei.com, kmpark@...radead.org,
	thomas.abraham@...aro.org, santosh.shilimkar@...com,
	srivatsa.bhat@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 02/15] mm: Initialize node memory regions during boot

Initialize the node's memory-regions structures with the information about
the region-boundaries, at boot time.

Based-on-patch-by: Ankita Garg <gargankita@...il.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 include/linux/mm.h |    4 ++++
 mm/page_alloc.c    |   28 ++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e19ff30..b7b368a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -621,6 +621,10 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
 #define LAST_NID_MASK		((1UL << LAST_NID_WIDTH) - 1)
 #define ZONEID_MASK		((1UL << ZONEID_SHIFT) - 1)
 
+/* Hard-code memory region size to be 512 MB for now. */
+#define MEM_REGION_SHIFT	(29 - PAGE_SHIFT)
+#define MEM_REGION_SIZE		(1UL << MEM_REGION_SHIFT)
+
 static inline enum zone_type page_zonenum(const struct page *page)
 {
 	return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8fcced7..9760e89 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4681,6 +4681,33 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
 #endif /* CONFIG_FLAT_NODE_MEM_MAP */
 }
 
+static void __meminit init_node_memory_regions(struct pglist_data *pgdat)
+{
+	int nid = pgdat->node_id;
+	unsigned long start_pfn = pgdat->node_start_pfn;
+	unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
+	struct node_mem_region *region;
+	unsigned long i, absent;
+	int idx;
+
+	for (i = start_pfn, idx = 0; i < end_pfn;
+				i += region->spanned_pages, idx++) {
+
+		region = &pgdat->node_regions[idx];
+		region->pgdat = pgdat;
+		region->start_pfn = i;
+		region->spanned_pages = min(MEM_REGION_SIZE, end_pfn - i);
+		region->end_pfn = region->start_pfn + region->spanned_pages;
+
+		absent = __absent_pages_in_range(nid, region->start_pfn,
+						 region->end_pfn);
+
+		region->present_pages = region->spanned_pages - absent;
+	}
+
+	pgdat->nr_node_regions = idx;
+}
+
 void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 		unsigned long node_start_pfn, unsigned long *zholes_size)
 {
@@ -4702,6 +4729,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 #endif
 
 	free_area_init_core(pgdat, zones_size, zholes_size);
+	init_node_memory_regions(pgdat);
 }
 
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP

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